Blade oscillating means for earthworking implements



May 22, 1951 P. LUND 2,553,926

BLADE OSCILLATING MEANS FOR EARTHWORKING IMPLEMENTS Filed Dec. 31, 1947JN VEN TOR. P5 Lu/vo .ixrn 93/ atented May 22, 1&51

BLADE QSCILLATING MEANS FOR EARTH- WGRKING IMPLEMENTS lPer Lund, Oslo,Norway Section 1, Public Law 690, August 8, 1946 Patent expires November19, 1966 1 Claim.

This invention relates to machines for road and ground working as wellas excavators and the like and its object is to increase the efficiencyof such machines. The invention is principally characterized in that theworking, particularly, excavating tools are adapted to be given arotating, translatory movement in relation to the holder of the tool insuch a way, that all points of the tool rotate in planes generallyparallel with or perpendicular to the plane of working of the tool withrespect to the surface of the ground. Through this rotating movement thetool acquires an oscillating motion in the direction of the advance ofthe tool with respect to the ground, whereby the working resistanceacting upon the tool is decreased and the efficienc'y of the machineincreased. The invention may with advantage be adapted for road planersand similar machines, where the tool, usually in the form of a bar or ablade, is driven by means of two or more crank-shafts parallel with eachother, which are connected by crank arms with the tool at acorresponding number of points.

The invention is illustrated by the accompanying drawing, whichdiagrammatically shows the drawing means for a grader or similar tool.

Fig. l is a side elevation of the arrangement, and

Fig. 2 a plan view of same.

In the example shown the tool consists of a blade 1, which is formed ofa piece of iron plate in the form of a bar and arranged to be advancedat an acute angle to the surface of the ground, as shown in Figure 1.According to the invention the blade is adapted to be given anoscillating movement by means of a number of crank shafts 2, 3, i, 5,which are connected with the blade by means of crank arms 6 formingobtuse angles with the crank shafts and which consequently describeconical surfaces when rotating. The rods may be connected with theplaner by means of ball joints 8, which are parallel with the crankshafts. All of the crank shafts and thereby the planer, also aresupported by tool holding arms i, and which are secured to the frame ofthe machine. The tool holding arms '1 have downwardly inclined forwardextensions la which mount the forward crank shafts 2 and 4 at theirlower ends, the inclination of these extensions determining theinclination of the blade I. Bevel pinions 9 are mounted at the upperends of the crank shafts 2, 3, l, and 5, and it will be understood thata unitary drive means (not shown) is provided for these pinions.

As shown in Figure 2 the blade is carried by four crank shafts arrangedin pairs at opposite ends of the machine. The crank arms are of equallength and adapted to rotate at equal speed,

at equal angles, and on phase, that is in such a way that the crank armsat all angle positions are located in crank shaft planes prallel witheach other. Thereby the blade will be given a translatory movement, thatis the front edge of the blade is moving parallel with itself, so thatthe blade, when advancing along the ground, will be given an oscillatingmovement in the direction it is being pushed, whereby the working of theground is facilitated.

In connection with certain types of machines, for instance groundbreakers but also with road working machines, it may be useful tocombine the rotation with translatory movement of the blade in such away, that all the points of the blade are rotating in planes, which aregenerally perpendicular to the working plane of the blade with respectto the surface of the ground. A blade of the kind shown in the drawingshould then be adapted for rotation around horizontal shafts.

A machine of the type described above may be used with advantage evenfor the removal of ice and snow from the roads.

I claim:

In a road grader, a pair of crank shaft holders having horizontallypositioned sections and downturned end sections at an obtuse anglethereto, a pair of crank shafts for each holder, each crank shaft havinga vertically positioned section with the vertically positioned sectionof one crank shaft rotatably mounted in a bearing in the horizontalsection of the crank shaft holder and the vertically positioned sectionof the other crank shaft rotatably mounted in a bearing in thedownturned section of the crank shaft holder each crank shaft having anouter section extending at an obtuse angle to the vertically positionedsection, a cutting tool of generally plane configuration, and ball andsocket joints connecting the outer ends of the crank shafts with thetool, whereby the cutting tool oscillates in parallelism with thedownturned ends of the crank shaft holders.

PER LUND.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS 74,090 Sweden Apr. 12, 1929

